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| zs1sam Member Since: 21 Jun 2013 Location: Cape Town Posts: 30   
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Greetings to all from sunny Cape Town!
Here is a brief description of the problem: 2011 110 Puma; 2nd battery fitted professionally with a National Luna split charging system; 2 power points fitted at the rear of the vehicle. One power point used to power a National Luna fridge / freezer which has a Danfoss compressor. The problem: I am a radio amateur (HAM); fitted in the vehicle is a HF transceiver. Power for the radio is direct from the 2nd battery. When the fridge is running and the radio is on, there is a very high level of interference on the radio. If I switch the fridge off, no noise. Simple solution is to switch the fridge when transmitting; however, I have, at times, forgotten to put the fridge back on. Besides my beer not being ice cold, I also have an irate wife!! 
Any solutions?? Sam ZS1SAM |
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5th Mar 2014 7:33am |
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| K9F Member Since: 12 Nov 2009 Location: Bournemouth Posts: 9610  
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Sounds like the fridge's motor is not suppressed. Have a read of this:-
http://www.vishay.com/docs/26529/gentecin.pdf If you go through life with your head in the sand....all people will see is an ar5e!! Treat every day as if it is your last....one day you will be right!! |
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5th Mar 2014 8:01am |
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| zs1sam Member Since: 21 Jun 2013 Location: Cape Town Posts: 30
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The following appears to be the solution. It may help others HAMS who also operate fridges/freezers with Danfoss compressors.
All fridges using the Danfoss compressor are notorious when it comes to the rf noise issues. The secret is to use a mains EMI filter, basically a small module which gets inserted inside the fridge in the power line (both positive and negative goes through it), and it's casing get connected to the metal casing of the fridge. The noise you hear on the radio is caused by the compressor controller, and radiates through the 12 volt power cable connected to the fridge. The filter absorbs the rf and stops it from getting out of the fridge. Thanks to those who responded Sam |
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5th Mar 2014 5:34pm |
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| Swollock Member Since: 16 Mar 2013 Location: Wellingborough Northants Posts: 262 
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Maplin in the UK do a cheap mains RFI filter module
http://www.maplin.co.uk/p/delta-suppression-filter-rg21x I have used these with great success for all kind of noise problems and only £2.99 so not a bank breaker if it does not work for you. 2008 Defender 110 XS CSW Volvo S60 T8 Triumph 1200 Rally Explorer G0UBX |
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5th Mar 2014 6:46pm |
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| Shax Member Since: 05 Oct 2010 Location: London Posts: 391 
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Try this....
http://www.defender2.net/forum/topic26844.html ... ,-------, .. I [__][_]|__ .. I __ |"_|"__| .. "(o)====(o)" ^^_-^-_^-^_^^^^^--^^^^ PAUL G7ALW 14.200 USB 26FB458 / 27.275 SSB |
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5th Mar 2014 10:57pm |
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